Oxygen, with an atomic number of 8, has
__________ electrons in the first energy level and
__________ electrons in the second energy level.
a. 1; 7
b. 2; 6
c. 3; 5
d. 4; 4
e. 5; 3
Answer: b
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In recombinant DNA experiments, ______ is used to cut pieces of DNA, and ______ joins these segments to form recombinant DNA
A. restriction enzyme; DNA ligase B. a transposon; a restriction enzyme C. a plasmid; DNA ligase D. DNA ligase; a restriction enzyme E. DNA ligase; a plasmid
Filtration of the blood in the kidney takes place in the
a. loop of Henle. b. glomerulus of Bowman's capsule. c. distal tubule. d. proximal tubule. e. collecting duct.
In Drosophila, the wild-type eye color is red. A mutation, vermilion, causes vermilion-colored eyes, unless there is a mutation in another gene, suv, which, when homozygous or hemizygous, results in eyes that are the wild-type red even in the
presence of the vermilion mutation. This is an example of A) forward mutation. B) reverse mutation. C) intragenic suppression. D) intergenic suppression. E) back mutation.
When climax and subclimax vegetation combine in different parts of a(n) ________, they provide habitats for a large number of plant and animal species
Fill in the blank(s) with correct word